bug#7088: `copy-tree' of a vector copy sharing structure.with original

[MON KEY <monkey@sandpframing.com>]

When copy-tree copies vectors the copy shares structure with the original.

This is unlike the behavior of copy-tree on a list of lists:

(let ((orig '((a b) (c d) (e f) (g h)))
      new-cp)
  (setq new-cp (copy-tree orig))
  (equal (elt
          (prog1 orig
            (setf (car new-cp) "bubba")) 0)
         '(a b)))
;=> t

(let ((orig [[a b] [c d] [e f] [g h]])
      new-cp)
  (setq new-cp (copy-tree orig))
  (string-equal (aref (prog1 orig
                        (aset new-cp 0 "bubba"))
                      0)
                "bubba"))
;=> t

Shouldn't idx 0 of the orig tree still be [a b]?

Note This bug _should_ prob. have stayed with Bug7083 but that bug
report was prematurely closed.

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/s_P\